Floating Drill Head Sub-Assembly for Torsional Shock Damping
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Solution Overview
Problem
Existing rock drilling rigs face challenges in effectively damping axial and torsional shocks during rotary and DTH drilling, with known solutions exhibiting durability issues in their dampening components.
Innovation Solution
A sub-assembly with axial floating arrangements and drive pins that allow limited axial movement, featuring immovable first ends and loosely mounted second ends, which act as torsional dampeners to absorb shocks, utilizing metallic pins made of spring steel and cushion rings for enhanced durability and vibration absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional dampening components are used in sub-assemblies, then vibration absorption is achieved, but durability of dampening components deteriorates
Solution Approach 1:
The drive pins serve dual functions: transmitting torque and dampening torsional vibrations. By making the torque transmission elements themselves capable of vibration absorption through controlled flexibility and clearance mounting, the system eliminates the need for separate dampening components that would require maintenance and replacement.
Solution Approach 2:
The drive pins are designed to perform multiple functions simultaneously: torque transmission, axial force transmission, and torsional vibration dampening. This multi-functionality reduces the number of components needed and improves overall system reliability by eliminating separate dampening components.
2Object-affected harmful factors
If complex dampening systems are implemented, then vibration absorption improves, but device complexity increases
Solution Approach 1:
The dampening function is merged into the existing torque transmission mechanism. The drive pins, which are already present for torque transmission, are designed with flexible mounting (clearance at second ends) that enables them to absorb torsional vibrations, combining two functions into a single component system.
Solution Approach 2:
The invention extracts the dampening function from separate complex dampening components and integrates it directly into the simple drive pin structure. This eliminates the need for additional dampening devices and simplifies the overall system architecture.
3Reliability
If durable dampening components are used, then reliability improves, but manufacturing cost increases
Solution Approach 1:
Instead of using expensive, complex durable dampening components, the invention employs simple, inexpensive drive pins with clearance mounting that can be easily manufactured and replaced if needed. The simplicity of the design reduces manufacturing costs while maintaining adequate service life.
Solution Approach 2:
The drive pins, being simple structural components already required for torque transmission, serve the additional function of vibration dampening without requiring special expensive materials or complex manufacturing processes. The clearance mounting provides the necessary flexibility using standard manufacturing techniques.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides durable, cost-effective shock absorption by using spring steel drive pins and cushion rings, effectively transmitting torque while mitigating torsional and axial shocks, suitable for various drilling units.
Implementation Method 1
the drive pins can bend in relation to their first ends under torsional shocks. The drive pins serve as torsional dampening elements and can absorb torsional shocks.
Implementation Method 2
an axial dampening arrangement comprising at least one first end cushion element and at least one second end cushion element for dampening axial shocks
Data Source
AI summary
A sub-assembly, rock drilling rig and method of absorbing vibrations in rotary and DTH drilling. The sub-assembly is for transmitting torque and axial forces between a rotating head and a drilling tool. There is an axial floating arrangement for providing an allowed limited axial relative movement between coupling elements of the sub-assembly. The arrangement comprises several axial drive pins for transmitting the torque. First ends of the drive pins are mounted immovably and second ends are mounted with clearances, whereby the drive pins can bend under torsional shocks. Thus, the drive pins serve as torsional dampening elements.